/*******************************************************************************
-
+
Header: FGAtmosphere.h
Author: Jon Berndt
+ Implementation of 1959 Standard Atmosphere added by Tony Peden
Date started: 11/24/98
-
+
------------- Copyright (C) 1999 Jon S. Berndt (jsb@hal-pc.org) -------------
-
+
This program is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free Software
Foundation; either version 2 of the License, or (at your option) any later
version.
-
+
This program is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
details.
-
+
You should have received a copy of the GNU General Public License along with
this program; if not, write to the Free Software Foundation, Inc., 59 Temple
Place - Suite 330, Boston, MA 02111-1307, USA.
-
+
Further information about the GNU General Public License can also be found on
the world wide web at http://www.gnu.org.
-
+
HISTORY
--------------------------------------------------------------------------------
11/24/98 JSB Created
-
+07/23/99 TP Added implementation of 1959 Standard Atmosphere
+ Moved calculation of Mach number to FGTranslation
+
+
********************************************************************************
SENTRY
*******************************************************************************/
-#ifndef FGATMOSPHERE_H
-#define FGATMOSPHERE_H
+#ifndef FGAtmosphere_H
+#define FGAtmosphere_H
/*******************************************************************************
INCLUDES
*******************************************************************************/
#include "FGModel.h"
-
+#include "FGMatrix.h"
/*******************************************************************************
COMMENTS, REFERENCES, and NOTES
-*******************************************************************************/
-/**
-The equation used in this model was determined by a third order curve fit using
-Excel. The data is from the ICAO atmosphere model.
-@memo Models the atmosphere.
-@author Jon S. Berndt
-*/
-/*******************************************************************************
+********************************************************************************
+
+[1] Anderson, John D. "Introduction to Flight, Third Edition", McGraw-Hill,
+ 1989, ISBN 0-07-001641-0
+
+*******************************************************************************
CLASS DECLARATION
*******************************************************************************/
-using namespace std;
-
-class FGAtmosphere : public FGModel
-{
+class FGAtmosphere : public FGModel {
public:
- // ***************************************************************************
- /** @memo Constructor
- @param FGFDMExec* - a pointer to the "owning" FDM Executive
- */
- FGAtmosphere(FGFDMExec*);
- // ***************************************************************************
- /** @memo Destructor
- */
+ FGAtmosphere(FGFDMExec*);
~FGAtmosphere(void);
-
- // ***************************************************************************
- /** This must be called for each dt to execute the model algorithm */
bool Run(void);
- // ***************************************************************************
- /** @memo Returns the air density
- @return float air density in slugs/cubic foot
- */
- inline float Getrho(void) {return rho;}
+ inline float GetTemperature(void) {return temperature;}
+ inline float GetDensity(void) {return density;} // use only after Run() has been called
+ inline float GetPressure(void) {return pressure;}
+ inline float GetSoundSpeed(void) {return soundspeed;}
+
+ inline float GetTemperatureSL(void) { return SLtemperature; } //Rankine, altitude in feet
+ inline float GetDensitySL(void) { return SLdensity; } //slugs/ft^3
+ inline float GetPressureSL(void) { return SLpressure; } //lbs/ft^2
+ inline float GetSoundSpeedSL(void) { return SLsoundspeed; } //ft/s
+
+ inline float GetTemperatureRatio(void) { return temperature/SLtemperature; }
+ inline float GetDensityRatio(void) { return density/SLdensity; }
+ inline float GetPressureRatio(void) { return pressure/SLpressure; }
+ inline float GetSoundSpeedRatio(void) { return soundspeed/SLsoundspeed; }
+
+ inline void UseExternal(void) { useExternal=true; }
+ inline void UseInternal(void) { useExternal=false; } //this is the default
+
+ inline void SetExTemperature(float t) { exTemperature=t; }
+ inline void SetExDensity(float d) { exDensity=d; }
+ inline void SetExPressure(float p) { exPressure=p; }
+
+ inline void SetWindNED(float wN, float wE, float wD) { vWindNED(1)=wN; vWindNED(2)=wE; vWindNED(3)=wD;}
+
+ inline float GetWindN(void) { return vWindNED(1); }
+ inline float GetWindE(void) { return vWindNED(2); }
+ inline float GetWindD(void) { return vWindNED(3); }
+
+ inline FGColumnVector GetWindUVW(void) { return vWindUVW; }
protected:
private:
float rho;
+
+ float h;
+ float SLtemperature,SLdensity,SLpressure,SLsoundspeed;
+ float temperature,density,pressure,soundspeed;
+ bool useExternal;
+ float exTemperature,exDensity,exPressure;
+ FGColumnVector vWindNED,vWindUVW;
+
+ void Calculate(float altitude);
+
};
+
+
/******************************************************************************/
#endif